ERIKS also supplies the types GR and GRST. These are virtually identical to the types R and RST, except in this case the metal inner ring is also completely encased in rubber. ERIKS uses FKM rubber here as standard, so these seals are ideal for use in acidic environments.
2. **Gather your tools** You will need a socket wrench or an open-end wrench, a flathead screwdriver, and a new valve cover gasket. Maintenance Tips